Thanks Randy What makes measuring tryptophan in pollen so much more difficult than measuring tryptophan in other foods? Pretty much every animal feed and food supplement I have looked at shows a tryptophan value in its AA profile. *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html